Robust feedback linearization for nonlinear processes control

Area of Science:

• Control Engineering
• Nonlinear Systems Theory
• Applied Mathematics

Background:

• Traditional feedback linearization theory assumes asymptotic stability, which often fails in practical applications due to state convergence issues.
• Existing methods for nonlinear process regulation necessitate considering all main and crossed state feedbacks, complicating controller gain determination.

Purpose of the Study:

• To propose a novel theorem based on Lyapunov theory to ensure uniform stability of nonlinear process states.
• To simplify controller design by utilizing only main state feedbacks while maintaining satisfactory performance.
• To demonstrate the applicability of the proposed technique in real-world systems like fuel cells and manipulators.

Main Methods:

• Development of a new theorem grounded in Lyapunov stability theory.
• Application of feedback linearization with a focus on main state feedbacks.
• Empirical validation using a fuel cell model and a robotic manipulator.

Main Results:

• The proposed theorem guarantees uniform stability for nonlinear process states when the linearized system is stable, addressing limitations of asymptotic stability.
• The simplified approach using only main state feedbacks yields satisfactory control performance.
• Successful application of the technique to a fuel cell and a manipulator demonstrates its practical viability.

Conclusions:

• The enhanced feedback linearization technique provides a more robust and practical approach to nonlinear process control.
• The study offers a theoretical advancement in stability analysis and a practical simplification in controller design.
• The method is effective for controlling complex systems such as fuel cells and robotic manipulators.